[ECOS] newbie query! spinlocks mlqueue

[Hans Hübner]

On Wed, 21 Dec 2005, jeane wrote:

> Thanks for the link I went through it, I'm new to ecos my assumption
> was while using a spin-lock
[...]
> I went through the spinlock's implementation on uni-processor I didn't
> see any while loop /test_and_set instruction in Cyg_SpinLock::lock()
> which will amount to the CPU spinning. Neither was there an
> implementation which will disable scheduling. So how does the uni
> -processor spin-lock guarantee "locking" across threads when
> pre-emptible scheduling is enabled.

>From the documentation:  "Therefore spinlocks are only appropriate for SMP 
systems where the current owner of a spinlock can continue running on a 
different processor."

-Hans

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